AngularJS Promises - Simulate http promises

AngularJS Promises - Simulate http promises

I wonder how to simulate a promise $http when I know that the request will
fail on the server-side. Here is my code:
if ( !ng.isString(email) ) {
var promise = $q.defer().promise;
$q.reject();
return promise;
}
return $http( {
method : "PUT",
url : "//localhost/update" ,
data : { data: email }
})
// Success handler
.success(response){ return response})
// Error handler
.error(errorMsg){ return errorMsg});